We have already seen how to enable secure browsing in Facebook. Similarly you can also find the active sessions in Facebook. To check active sessions in your Facebook account, click the Account link and select Account Settings from the displayed menu list.
In the Account Settings page, select Security option from the menu list.
In the Security Settings page, click the Active Sessions link. This would display the details about the current sessions and the last accessed session.
You can use this feature to check if any other person is using your Facebook account from an unknown location or devices. The active sessions got my device type correctly but the location is 400 km away from my place (That’s why mentioned as Approximate? :-)).